Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcf3330fbc4d05b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 04:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecf797a6d9c5682954586f11fec35488 SHA-1: c51ba8cc08480df7a425efd36d498e9356a0beb4 SHA-256: 5dcf3330fbc4d05b8c1abfaee66448983b7aad88721ff60423278a223b00d9e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to funnel users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=connecting+phone+to+pc+via+usb PDF link annotation
    • http://ccadl.com/files/20210910234625.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/gulokezap.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/sofodoguziturazoxewuviweg.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/56697755560.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145249822926---jolonutewajanepolodivilod.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc02182d9---18886222880.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/lejuxi.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/23469779365.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/20999849708.pdfIn PDF document text
    • https://esvigo.com/upload/files/63627045204.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/18230557676.pdfIn PDF document text
    • https://onecre.com/images/content/files/30421077289.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/bigolamexoxekojog.pdfIn PDF document text
    • http://bdnchem.com/upload/files/legunowimexiludom.pdfIn PDF document text
    • http://guowangcable.com/d/files/kuludelukelodod.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/gufomez.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lanefapemavovijovura.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/xotivap.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/84978180150.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/61766985800.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/32726465368.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/48383548704.pdfIn PDF document text
    • http://taigesw.com/upload/files/satiwevex.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/mifewamivu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10844 bytes
SHA-256: 990b67155f07f9442602f7021c6e7f504b722eff7083c2b7feb4c86de28f589a
font_01_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 17568 bytes
SHA-256: d955a3ad11e6bff329203174988253f51f41f1b873a1db913d85277821760af7

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